Just north of Flagstaff is a super interesting landscape shaped by volcanic activity. For an excellent vast view of this volcanic landscape and to get a glimpse into the top of Sunset Crater itself, hiking to O'Leary Lookout is a must. O'Leary Lookout is just outside of Sunset Crater Volcanic National Monument so there is no entrance fee and the trail is lightly trafficked. Besides the great panoramic views and steep workout, visiting the fire lookout tower at the top is a rewarding perk of the climb!